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Hydration effects on dynamics of polyglycine and sodium poly(L-glutamate)

✍ Scribed by Scott D. Kennedy; Robert G. Bryant

Publisher
Wiley (John Wiley & Sons)
Year
1990
Tongue
English
Weight
759 KB
Volume
30
Category
Article
ISSN
0006-3525

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✦ Synopsis

Solid state nmr methods were applied to the study of the motions and structural heterogeneity in polyglycine, sodium poly (L-glutamate) , and poly (L-alanine ) . The response of both the main-chain and side-chain resonances to the addition of water was studied using static and magic-angle sample-spinning line shapes as well as the carbon spin-lattice relaxation times, the proton spin-lattice relaxation time in the rotating frame, and the protoncarbon cross-polarization time. The polyglycine motions are not drastically affected by the addition of water when the polymer is in the 31-helix or the P-sheet structure. The sodium poly (L-glutamate) , however, responds to increased hydration with little motion in the main-chain carbon atoms, but considerable flexibility of the side-chain atoms. The greatest motions are reported for the C, carbon with rotational amplitudes about the C,-C, bond of about of 50". In addition, motions somewhat less than half this size are required closer to the main chain.

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